worked on thread safety with tasks

app/common/threadedobject.cpp

@@ -0,0 +1,37 @@
+#include "threadedobject.h"
+
+ThreadedObject::ThreadedObject()
+{
+}
+
+void ThreadedObject::LockDeletes()
+{
+  threadobj_delete_lock_++;
+}
+
+void ThreadedObject::UnlockDeletes()
+{
+  Q_ASSERT(AreDeletesLocked());
+
+  threadobj_delete_lock_--;
+}
+
+bool ThreadedObject::AreDeletesLocked()
+{
+  return (threadobj_delete_lock_ > 0);
+}
+
+void ThreadedObject::LockMutex()
+{
+  threadobj_main_lock_.lock();
+}
+
+void ThreadedObject::UnlockMutex()
+{
+  threadobj_main_lock_.unlock();
+}
+
+bool ThreadedObject::TryLockMutex(int timeout)
+{
+  return threadobj_main_lock_.tryLock(timeout);
+}